I picked up a 40z4100 today.
I'll add some picture tomorrow, and I'm keeping a Very sharp eye on this 'sparkle'
So far I'm very impressed with the TV. I booted up GT5p on the PS3 and said 'OH GOD THE LAG' but game mode made that all better
I'm still trying to find good picture settings, right now I'm trying a few known good ones from the w4100.